Oven heat regulator



Sept. 20, 1932. o. J. LEINS ET AL 1,878,937

I OVEN HEAT REGULATOR Filed Aug. 12, 1929' 4 Sheets-Sheet 1 Spt. 20,1932. 0 LElNs ET AL 1,878,937

OVEN HEAT REGULATOR 4 Sheets-Sheet 3 Filed Aug; 12, 1929 Sept. 20, 1932.o. J. LEI-NS ET AL OVEN HEAT REGULATOR Filed Aug. 12, 1929' 4Sheets-Sheet 4 Patented Sept. 20, 1932 UNITED STATES PATENT oFFicE OSCARJ. LEINSAN HOWARD G. RAWLINGS, OF MILWAUKEE, WISCONSIN, ASSIGNORS TOCLAUS MANUFACTURING 00., OF MILWAUKEE, WISCONSIN, A CORPORATION OFWISCONSIN OVEN HEAT REGULATOR Application filed August 12, 1929. SerialNo. 385,424.

Our invention relates to oven heat regulators and has for its primaryobject the provision of an improved device adapted for installation inan oven, particularly as embodied in modern domestic ranges, as anassembled unit. Secondly, it is the further object of our invention toprovide a structure which may be installed and supported on the range ina simple manner and without the aid of extra supporting devices.

Oven heat regulators of the general type to which our invention relatescomprise means for controlling the heating medium, that is, the gas, oilor electric current and a thermally operated device which actuates thecontrolling means. It is desirable forobvious reasons, to mount thethermally'responsive device in the oven in such a Way and at such aplace that its action will be indicative of the prevailing temperaturetherein, and, for various reasons it is desirable to mount thecontrollng mechanism in a remote position to facilitate connection inthe heating system and to reduce the piping or wiring. 7

It is also desirable to remove the controlling mechanism from therelatively hi h heating temperatures. Accordingly, thet ermallyresponsive device is properly mounted within the oven itself while thecontrolling device is located in proximity to the heating means and itssupply.

The relationship between. the thermally responsive device and thecontrolling device is obviously of primary importance. Thatis,

the actuating member of the controlling device should always be inpredetermined rela ter of appropriately supporting the assembly in itsproper place.

It is well known that oven heat regulators must be capable of handcontrol for the purpose of selecting particular temperatures forparticular purposes and that the means provided for this purpose ispreferably located onthe outside of the oven. The structure of ourinvention contemplates the inclusion of such a selective device .in theunit assembly to which we have referred, and, as will appear,this'selective device is mounted upon the extension in close proximityto the thermostatic element.

In addition to the advantages above pointed out, the simplicity in whicha heat regulator may be installedin a range is particularly marked inthe structure which We have devised. The controlling device is supportedfrom elements already necessarily in the range and the thermallyresponsive device issupported from the controlling device. Furtheradvantages in this connection will factory example of the presentinvention.

An improved feature of our invention is that form of structure which wehave devised whereby it may be installed in the range by the simpleexpedient of passing it in endwise through an opening which issubsequently closed by one portion of the device and per-,

mitting-another portion of the device to be disposed in another opening,from which position the connections, both for the purpose of support andfor the purpose of conducting the heating medium, are made.

It would appear that certain features of our invention are useful in anyoven, be the heating medium gas, oil, or electric current. Certainfeatures of our' invention are further particularly adaptable to ovensheated by gas or oil, and still further features are particularlyadapted to gas ovens. The appended claims are drawn accordingly, and,since we contemplate our invention as relating specially to gas ovens,and since all of its features are useful therein, we have shown ourregulator described herein as particularly relate to a gas heated oven.

Moreover, we show a device which we have actually built and used and inwhich novelty is found in its narrow as well as its broad aspects.

The invention is illustrated in the accompanying drawings, in which Fig.l is a perspective view of a gas range showingone embodiment of thisinvention in connection therewith;

Fig. 2 is a fragmentary vertical section through the oven wall taken onthe line 22 of Fig. 1 and showing the regulator unit assembly inelevation;

Fig. 3 is a vertical section through the regur lator unit assembly onthe line 33'of Fig. 6';

Fig. 4; is a fragmentary detail section taken on the line 4-4 of Fig. 3;

Fig. 5 is a fragmentary on the line 5-5 of Fig. 3; V

Fig. 6 isan elevational view of the back or rear side of theregulatorunit assembly;

Fig. 7 is a fragmentary view showing, in front elevation, thetemperature selecting dev ce;

Fig. 8 is a horizontal section taken on the line 88 of Fig. 3;

Fig.9 is a horizontal section taken on the line 9.9 of Fig.6;

Fig. 10 is a fragmentary detail section taken on the line 10-10 ofFig.6;

Fig. 11 is a vertical section through the oven wall showing the mannerof installing the regulator unit assembly;

Fig. 12 is a fragmentary elevation of the inner side of the ovenwall,-also showing the manner of installing the regulator'unit assembly;and

Fig. 13 is a perspective view of an oven partially broken away andshowing another embodiment of the invention.

In the drawings, the gas range, designated in its entirety at 5, has anoven 6 provided with a wall 7 and with a door opening having door means8.

The gas supply pipe is indicated at 9 and the oven is shown as having amixing head 10. The oven burner is indicated at. 11 and the gas isdelivered from the pipe 9 to the head 10 and through this head to theburner 11. The head 10 has the usual air admission openings indicated at13 and the connection from the pipe 9 is through a connecting tubedesignated in its entirety at 14, which tube has a nipple l5 deliverinthrough the head 10 to the burner. The tu -e 14, or some otherequivalent connection between the supply pipe and the oven burner is anelement already necessarily in the range. This element may vary widely,and this and the other parts above referred to may be of any suitableform, those shown completing the necessary disclosure of an illustrativegas heated oven in which the present invention is adapted to beembodied.

The supply of gas to the oven burner 11 is adapted for hand control by avalve 16,

detail section taken which may be of conventional or other form, whichvalve 16 is adapted to open or close the gas supply to the burner 11, aswell as to manually vary the amount of gas supply from closed to fullopen position.

The tube 17 (Fig. 2) connects the head 10 with the burner 11.

In the illustrated embodiment of the invention, the wall 7 is the innerside wall of the oven 6, but it is to be understood that the regulatorof the present invention may be arranged in some other wall of the ovenor chamber, the heat of which it is desired to regulate. The inventionis adapted for embodiment in an oven having an inner wall with asurrounding space or in an oven without such an inner wall and withoutsuch a surrounding space. In other words, the present invention isadapted for use in a wide variety of oven structures.

The regulator designated in its entirety at 20 comprises an assembledstructure consisting of a controlling device 21, an extension 22 and athermallyoperated device 23 connected to actuate the controlling device21 and constituting with said controlling device 21 and 'extension 22 aunitary assembly in which the thermally operated device 23, controllingdevice 21 and actuating connection, designated in its entirety at 24,may be accurately brought into proper relationship and calibrated at thefactory and the device thereafter installed as a unit assembly withoutaltering the relationship of the parts.

A selecting device 25 is also preferably carried on the extension 22 toconstitute a unitary part thereof, and this selecting device is adaptedfor adjusting the thermally operated device for the purpose of selectingthe temperature which the device is adapted to maintain within the ovenas desired.

The selecting device is shown as being supported upon the extension 22with the controlling device 21'.

In the illustrated embodiment of the invention, the thermally operateddevice 23 in cludes a spindle housing 28 which may be in the form of ametal casting having an internally threaded transverse opening 29 at itsupper end and an internally threaded longitudinal opening 30 at itslower end and an intermediate portion 31 generally cham nel-shaped intransverse section. The adjusting device includes a dial spindle 32which has threaded engagement in the opening 29. Toward its outer endthe spindle 32 has an integral shoulder or flange 33, and outwardly ofthe shoulder 33 the outer end 34 of the spindle is adapted to receive aknob 35, the spindle end 34 being splayed on opposite sides at-36 orotherwise suitably formed, and the opening in the knob 35 beingcorrespondingly formed so that when the knob 35 is mounted upon the endof the spindle it will be splined to turn the spindle 32 with it. The

knob 35 is clamped in place by a dial screw 37 which threads into aninternally threaded axial opening in the outer end of the spindle.

The dial 38, which is of circular cupped formation, has an axial opening39 through which the spindle end 34 is adapted'to pass, this openingbeing small enough so that the spindle portion of the dial will beclamped firmly between the shoulder 33 and the knob 35 when the screw 37is tightened to clamp the knob 35 and dial 38 firmly in place againstthe shoulder 33. v

For the purpose of holding the dial 38 in its proper calibrated positionand against turning about the spindle, vibration or shakeproof washers40 are preferably provided, one being interposed between the shoulder 33and one side of the central part of the dial 38 about the opening 39 andthe other being interposed between the knob 35 and the opposite side ofthe dial. These washers 40 have serrations 41 about the openingstherethrough, and the small cars formed by these serrations are struckout of the plane of the washer sufiiciently and preferably. from bothsides to provide a firm gripping action be tween the parts between whichthey are interposed.

The spindle housing 28 has an externally threaded nipple 45 extendingoutwardly, and

coaxial with the opening 29 and clamped against the upper end of thehousing 28 at the inner end of this nipple 45 is a cover plate 48. Thecover plate is clamped against the housing in this manner by a nut 46threaded upon the nipple 45. The sides of the nipple 45, adjacent themounting of the cover plate thereon, are preferably splayed or of otherirregular formation at 58, and the opening through the cover plate ispreferably c0rrespondingly formed to hold the cover plate againstturning upon this nipple. The cover plate 48 may be of sheet metal andis shown as of circular or disc form with the central opening fittingover the splayed portion of the nipple 45.

The outer marginal edge of the rover plate 48 is preferably offset ordished outwardly slightly at 49 for a purpose whichwill hereinafterappear. and an integral lug 50 is turned outwardly from the top of thecover plate and forms a pointer or indicator for cooperation with thedial scale or calibrations 51. i

For the purpose of tying the thermally operative device or the upper endof the unit assembly to the oven wall 7, a pair of tying tangs 53 arestruck out forwardly from the cover plate 48 and are adapted to bebrought into the opening 54 in the oven wall 7 in the positions shown indotted lines in Fig. 3 and then struck or bent over outwardly againstthe inner surface of the wall 7 to tie the upper end of the unitassembly thereto. For i and the dial of white or other porcelain enamel.The scale 51' comprises suitable markings in terms of temperaturegraduated circularly about the outer surface of the dial and adapted tobe brought selectively into register with the pointer 50 by turning theknob 35 to set the thermally operated device for any desiredtemperature. 7

For example, by setting the 250 degree marking of the scale 51 inregister with the pointer 50, a temperature of 250 degrees F. will bemaintained within the oven 6 by the regulator, and by turning the knob35 to bring the 500 degree or 550 degree marking into register with thepointer 50, the inner end of the spindle 32 will be projected furtherinwardly, and by its cooperation with the upper end of the bi-metallicthermosatic strip 56, will set the thermally operated device to maintaina temperature of 500 degrees or 550 degrees F. in the oven. 4

A coiled spring 60 surrounding the spindle 32 and interposed between thenipple 45 and the shoulder 33 urges the dial spindle outwardly at alltimes so that in the event of any looseness or wearing loose of thecooperating threads on the spindle and in the opening 29 thethreads willbe held'in tight cooperation in one direction. A washer 61 may beinterposed between the nipple 45 and the adjacent end of the spring 60.

Theinstalled regulator may be calibrated with a standard thermometer byplacing such a thermometer within the oven with the regulator in placeand, in the event of any discrepancy between the thermometer reading andthe dial reading of the regulator, the screw 37 may be releasedsufficiently to release the washers 40, so that the dial 38 may beturned free of the spindle 32 in either direction to register the scalemarking 51 corresponding with the thermometer reading with the pointer50. For example, if the thermometer reading is 425 degrees F. and thedial marking 400 degrees F. is in register with the pointer 50 in thesetting of the selecting device for maintaining that temperature, thisdiscrepancy of 25 degrees between the regulator setting and the standardthermometer reading may be corrected by releasing the screw 37 andturning the dial 38 in a clockwise direction (Figure 7), about thespindle 32 and between the washers 40 to register the dial marking 425with the pointer 50, whereupon the dial is again clamped tightly betweenthe washers 40 and in the desired angular position with reference to thespindle 32 by tightening the screw 37.

The controlling device 21 comprises a valve body 62 cored to provide apair of internal valve chambers 63 and 64 separated by an integralpartition 65 having a valve opening 66 therethrough. The lower chamber64 has a downwardly opening internally threaded opening 66 closed by acap 67 which is adapts ed. to be threaded into and from the opening 66'and which has a hexagonal flange or head 68 at its lower end which seatstightly against the bottom of the body portion 62.

The valve opening 66 is controlled by a valve disc 69 having an axiallydepending portion ,70 which fits in the upper reduced end of a generallyconical spring 71 interposed between the valve disc 69 and the cap 67and yieldingly urging the valve disc 69 to its seat formed by theportion of the partition 65 marginally surrounding the opening 66. Thecap 67 is recessed at 72 to receive the adjacent enlarged end of thespring 71.

A pilot or lighter tube 7 4. is threaded at 75 into the valve body 62and opens into the chamber 64 through a duct 79. The free end of thetube 74 has a pilot tip 7 7 disposed to maintain a pilot or lighterflame adjacent the burner 11. A threaded metering screw 78 threaded intothe valve body and cooperable with the duct 79 leading from the chamber64 into the pilot tube 74 is adapted for adjusting or regulating thepilot flame at will.

In the illustrated embodiment of themvention, the connecting tube 14between the supply pipe 9 and the supply nipple 15 for the burner 11 ismade in two sections. The

section leading from the supply pipe 9 leads to the valve chamber 64 andthe other section leads from the valve chamber 63 to the supply nipple15. For the purpose of always maintaining at least some supply of gasfrom the chamber 64 to the chamber 63, and, therefore, to the burner 11when the valve 16 is open so that the burner 11 cannot be extinguishedbythe regulator with the valve 16 open, a by-pass passage 80 connectsthe chambers 63 and 64.

A metering screw 81 threaded into the valve body and cooperable with thepassage 80 is adapted for metering or regulating this passage and thefuel supply to the passage 63 therethrough.

The extension 22 comprising a tube. 85 threaded at its upper, end intothe opening 30 of the spindle housing 28 and at its lower end into anintegral hub 86 .on the top of the valve body 62 joins the valve bodyand the spindle housing and thermally operated device carrier into aunitary assembly.

The bi-metallic thermal sensitive member 56 and its mounting and mannerof employment, as wellas the means for harnessing 1 the movement of thisthermal sensitive memher and for manipulating the gas valve orcontrolling device 21 thereby, per. se, form the subject matter of theco-pending application of Oscar J. Leins and Clarence Wantz, Case 1,filed of even date herewith.

The thermostat strip or thermal sensitive element 56 is of bimetallicformation comprising two generally rectangular laminations 56a and 56bof different ratio expansional materials. One end of this strip 56 hasan opening 90 which the reduced inner end 91 of the spindle 32 enters.

The engagement of the reduced end 91 of the spindle 32 in the opening 90is preferably relatively loose so as not to interfere with the action ofthe thermostatic member 56 which is by the engagement of this reducedend 91 in the opening 90 suspended on the inner end of the spindle 32.The suspended support of the thermally sensitive member and particularlythe. free suspended support of this member on the spindle 32 of theselecting device are also important aspects of this invention. Turningof the knob 35 in a clockwise direction (Fig. 7) threads the spindle 32inwardly and the inner end of the spindle by its shouldered cooperationat 91 with the upper end of the thermalsensitive member 56 tilts thismember about the pin 102 as a fulcrum in a clockwise direction (Fig.3)swinging the lower end of the thermal sensitive member against the head44 of the rocker arm 92 which is turned in a counterclockwise directionupon its pivot 93 thereby and through the rod 95 and stem 96 moves the"alve 69 away from its seat. Turning of the knob 35 in the oppositedirection threads the spindle 32 outwardly, whereupon the spring 71moves the valve 69 toward its seat and swings the thermal sensitivemember 56 in the opposite direction about-the fulcrum 102 to hold theupper end of the thermal sensitive member in cooperation with thespindle 32. In this manner turning of the knob 35 provides a valveopening corresponding with the setting of the dial 38 and therebyprovides for obtaining a temperature within the oven cor- 1 the spring71 so that the temperature for which the regulator is set will beaccurately maintained.

The rocker arm 92 is j ournaled for rocking movement or oscillation upona pin 93 and said arm 92 has a T-shaped head 94. One side of this head94 cooperates with or abuts the lower end of the thermal sensitiveelement 56 and the opposite end cooperates with or abuts the upper endof a motion transmitting or conveyor rod 95. The rod 95 extends downthrough the tube 85 and its lower end abuts a valve pin 96, the lowerend of which, in turn, engages the valve disc 69 in a recess therein asshown, and is adapted to unseat the valve disc an amount governed by thesetting of the spindle or selecting device 32. With this valve disc 69unseated in conformity with the setting of the adjusting device of theregulator, any tendency of the temperature within the oven to exceed thetemperature for which the device is set will flex the thermal sensitivestrip 56 accordingly and the lower' disc 69.

The pin 93 is supported at its opposite ends in integral side arms 100on the housing member 28, and the thermal sensitive strip 56 is confinedbetween its ends by a pin 102 extending across the back or inner side ofthe strip 56 and supported at its opposite ends in integral side arms103 on the housing member 28. The valve pin 96 is provided with abushing or bearing member 104 threaded in the ingegral hub'86 of thevalve body and having a ange 105 seating against the bottom side of thetop wall of the valve body with an axially depending portion 106.

The flange 105 is of hexagonal or other con.- tour to facilitatethreading the bearing member into place. The upper end of the bearingmember 104 is counterbored at 107 to receive and guide the lower end ofthe actuating rod 95.

From the foregoing, it will be apparent that the thermostat element 56,which is composed of two metals having different coeiiicients ofexpansion, occupies a position for functioning without binding orinterfering in any way with its free warping properties. This thermostatelement is floating in action and has a floating support so that itsmovement accurately follows the thermal variations only. This floatingmounting and positioning of the thermostat eliminates any deformation inany way bywarps, bends, twists, or the like, which would introducevariables difficult to screen, out and standardize to obtain astandardized thermal action of the element. The resulting element and tspositioning and mounting provides a thermostat which is not only highlysensitive, but very accurately fol-' lows thethermal changes. The lever92, together with the supports and fulcrums for controlling device 21.'The result harnessing the movement of the thermal sensitive element,provides the maximum movement necessary for manipulating the is, thatthe valve travel speed is relatively high, assuring actuation with ashortheating period and an abrupt closing off of the gas when thedesired temperature is attained, is

provided for, all without the use of reduction gears, threads or thelike, the standard pitches of which are not suitable for. this purpose.

The side wall 7 of the oven has, in addition to the opening 54 alreadyreferred to, a second opening 110. The valve body 62 of the controllingdevice 21 is of sucha configuration that the largest dimension taken inany direction from point 150 of Figure 11 is less than the diameter ofthe cover plate 48,

' so that the opening 54 through which the device is installed, may beclosed by the cover plate 48 which may be smaller than the dial 38itself. The valve body 62, together with the pilot tube 74 and with thethermally operated device 23, extension 22 and selecting device 25,combined in a unit assembly,.is adapted to be inserted into the oventhrough the opening 54. The opening 110 is preferably positioned tolocate the valve member at a point adjacent to the gas supply line tothe burner 11, as well as in a zone giving free access to the differentpoints necessary to adjust, and preferably in a position which will berelatively cool while the oven is in service.

In installing the unit assembly, as shown in Fig. 11, it may be invertedand the controlling device 21 entered through the open ing 54 in theoven wall as shown in Figs. 11 and 12. Then continuing the insertion ofthe controlling device end of the unit assembly, the thermally operateddevice at 23 of the assembly is swung upwardly through the positionshown in dotted lines in Fig. 11, swinging the controlling device end 21downwardly into theopening 110, and the thermally operated device end 23upwardlv into the opening 54. The outer end 112 (Fig. 2 of the valvebody 62 is swung through the opening 110, the valve body beingpreferably provided with a flange or shoulder 113 (Fig. 2) which seatsagainst the inner side of the oven wall 7 when the regulator isinstalled to operative position. The outer end 112 of the valve body 62which extends through the opening 110 to the outside of the oven isprovided with the tapped openings 114 (Fig. 2) through which therespective tube sections 14, for supplying the oven burner, areconnected with the valve chambers 63 and 64, as already described. Thesupply tube 14 for the oven burner is a necessary element of the range,and, when the sections of this tube are connected with the valve body62, the unit regulator assembly is supported by the tube sections 14without additional supports.

As the thermally operated device 23 is moved into the opening 54, thecover plate 48 seats against the outer surface of the oven wall 7surrounding the opening 54 and closes this opening, the centrally dishedportion of the cover plate preferably fitting into the opening, as shownin Fig. 3. As already pointed out, the tying tangs 53 move into theopening 54 in the positions shown in dotted lines in Fig. 3 and are thenbent or struck out into cooperation with. the inner side of the wall 7and tiethe upper end of the assembly firmly in place in the opening 54.

The device is thereby installed in the range in a simple manner and asan assembled unit as well as without the aid of extra supportingdevices.

The thermally responsive device is disposed so that its action will beindicative of the prevailing temperature'in the oven, and thecontrolling mechanism is'disposed in a. remote position to facilitateconnection in .the heating system without additional packing or wiring.v thermally responsive device and the controlling device is fixed in theunit assembly and this relationship may be made and the deviceaccurately gauged at the factory. The matter of installation of the unitassembly of the present invention becomes therefore, a mere matter ofappropriately supporting the assembly in its proper place. The assemblyincludes a selecting or adjusting device, and this device is mountedupon the extension in close proximity to the thermostatic element. Thecontrolling device is supported from elements already necessarily in therange, namely, the supply tube sections 14, and the thermally responsivedevice is supported from the'controlling device. The device is installedby the simple expedient of passing it in endwise through the opening 54which is subsequently closed by one portion of the device and anotherportion of the device is adapted to be disposed in another opening110'for the purposes of support and for the conduct. of the heatingmedium. The dial is on the side of the oven and the'adjustment fortemperature control may be made entirely on the outside of the oven,either while the oven is hot or cold. The controlling device is lo-'cated at a point adjacent to the gas supply line and is positioned tohave free access to the different points necessary and, in addie tion,is disposed in a relatively cool zone.

The oven is shown in Fig. 2 as provided with a horizontal baflieorbottom wall 120 marginally supported upon a bracket 121 secured to thewall of the oven and the baffie or bottom plate 120 and bracket 121 arenotched as shown, to permit the passage of the extension 22therethrough, it being understood that the plate 120. may be arrangedThe relationship between the in place after installation of theregulator. The connection between the lower end of the tube 85 and thevalve body 62 has a nut 122 and the dial 38 has an integral stop pin 125which cooperates with the pointer 50 to limit the rotation of the dialin each of its opposite controlling regulator connected between twosections and with the sections of the tubing 14' arranged to supply thegas to the forwardly located mixing head 10'. The sec tions of the tube14, between which the valve body 62' of the controlling device isconnected and upon which the controlling device is supported, are inthis case angularl disposed. The oven wall is indicated at the selectingor temperature adjusting device at 25 and the regulator comprises a unitassembly as before, and is installed as explained in connection with theprevious embodiment.

The opening through the oven wall 7 for the valve body 62' of thecontrolling device is indicated at 110'.

The invention is capable of a wide range of modification and is adaptedfor a wide range of uses, and we do not intend, therefore, to be limitedto the particular details,

nor tothe particular use or manner of shown or described.

We claim 1. The combination with an oven having a wall of a heatregulator therefor, comprising an assembled unit consisting of anextension having a controlling device, a thermally opuse erated deviceand a selecting device all mounted upon said extension in precorrelatedrelation and constituting a unitary assembly adapted for application tothe oven in unitary assembled relation and by movement of thecontrolling. device into and through the space inside of the oven wall.

2. The combination with an oven having a wall of a heat regulatortherefor, comprising an assembled unit consisting of an extension havinga controlling device, a t ermally operated device and a selecting deviceall. mounted upon said extension in precorrelated relation andconstituting a unitary assembly adapted for application to the oven inunitary assembled relation and by movement of the controlling deviceinto and within the space inside the oven Wall and with the selectingdevice continuously outside the oven.

prising a controlling device, an extension, :1

thermostatic device and a selecting device "supported with saidcontrolling device, said extension and thermostatic device being on oneside of said wall, and said selecting device on the other side of saidwall, and means passing through said opening for connecting saidselecting device with said thermostatic, device, said controllingdevice, extension and thermostatic device being capable of being passedthrough said opening in installation.

4. A permanently assembled structure comprising a controlling device,and an extension therefrom, a thermostat mounted on said extension, :1selecting device also carried on said extension, said thermostat andsaid selecting device being adapted for disposition on opposite sidesor" a. wall, and means connecting said selecting device with saidthermostat and adapted for passing through an opening in said wall, saidcontrolling device, extension, thermostat and selecting deviceconstituting a unitary assembly adapted for application to said Wall inunitary assembled relation.

5, A permanently assembled structure comprising an extension, athermostat mounted on said extension, a selecting device also mounted onsaid extension, said thermostat and said selecting device being adaptedfor disposition on opposite sides of a wall with the extensionon theinside of said wall, means connecting said selecting device with saidthermostat and adapted for passing through an opening in said wall, saidextension, thermostat and selecting device constituting a unitaryassembly adapted for application to said wall in unitary assembledrelation, a control device; andmeans disposed on the inner' side of thewall for transmitting the action of the thermostat to said controldevice.

6. A permanently assembled structure comprising a controlling device,and an extension therefrom, a thermostat mounted on said extension, aselecting device also carried .on said extension, said thermostat andsaid selecting device being adapted for disposition on opposite sides ofa wall, and means connecting said selecting device with said thermostatand extending in-operation through an opening in said wall, saidcontrolling device and said thermostat being passed in application ofthe assembled structure to the wall through the same opening throughwhich the connecting means between the selecting device and thethermostat extends in operation.

7. A permanently assembled structure comprising a controlling device,and an'ex tension therefrom, a thermostat mounted on said extension, aselecting device also carried on said extension, said thermostat andsaid selecting device being adapted for disposition on opposite sides ofa wall, and means connecting said selecting device with said thermostatand extending in operation through an opening in said wall, saidcontrolling device and said thermostat being passed in application ofthe assembled structure to the wall through the same opening throughwhich the connecting means between the selecting device and thethermostat extends in operation, said wall having a second openingadjacent which said controlling device is adapted to be brought in theapplication of said assembly for connection with a heating medium supplyline.

8. In combination, an oven having an opening in the wall thereof, acontrolling device,an extension therefrom, and a thermostatic device,all capable, while assembled, of being passed through said openingduring installa'tion, a selecting device mounted on said extension anddisposed outside said well, and means on said extension for closing saidopening. 7

9. In combination, an oven having an opening in the wall thereof, acontrolling device, an extension therefrom, and a thermostatic device,all capable, while assembled, of being passed through said openingduring installation, a selecting device mounted on said extension anddisposed outside said wall, and means on said extension "for closingsaid opening, said wall having a second opening and saidcontrollingdevice being adapted to be brpught to position adjacent said secondopening for connection with a heating medium supply line and for closingsaid second opening. I

. 10. The combination with an oven having a wall of a heat regulatortherefor, comprising an assembled unit consisting of an extension havinga controlling device, a thermally operated device and a selecting deviceall mounted upon said extension in pre-correlated relation andconstituting a unitary assembly adapted for installation of saidextension and thermally operated device within the inside of the ovenwall, with said extension, controlling device, thermally operated deviceand selecting device in unitary assembled relation, and a heating mediumsupply line for the oven connected with said controlling device. 7

11. In combination, an oven, a controlling device, a heating mediumsupply line connected with said controlling device. an extensiondisposed generally vertically within the oven structure and mounted onsaid controlling 12..In a range, the combination of means j the ovenstructure in assembled relation by endwise insertion of the controllingdevice end through said first opening, said controlling device beingdisposed upon complete installation in and closing said second openingand adapted for connection with said heating medium supply means 13. Incombination, an oven, :1 heat regulator assembly comprising acontrolling device consisting of a valve body, a valve in said body, anextension mounted on said valve body, a spindle housing mounted on saidextension, a spindle having threaded engagement with said housing, athermostat mounted upon the regulator assembly, a motion transmittingconnection between the thermostat and said valve, said spindle havingselecting cooperation with said thermostat at the inner side of theregulator assembly, and means on said spindle for manipulating thespindle to adjust the thermostat from the outer side of the assembly,the extension, thermostat and actuating connection between thethermostat and valve being disposed within the oven and the extension,controlling device, thermostat and selecting device being applied to theoven in unitary assembled relation. f

14.. In combination, a wall having an opening therethrough, a thermallyoperated device including a thermostatic element capable of passingthrough said opening and including a support for disposition on one sideof said wall, a spindle having threaded engagement with said support,selecting means on said spindle for manipulating the spindle to adjustthe thermally operated device from the opposite side of said well, andmeans on said support for closing said opening.

15. In combination, a wall having an opening therethr'ough, athermallyoperated device including a thermostatic element capable of passingthrough said opening and including a support for disposition on one sideof said wall, a spindle having threaded engagement with said support,selecting means on said spindle for manipulating the spindle to adjustthe thermally operated device from the opposite side of said wall, andmeans on,

said support for closing said opening, said last means comprising acover plate having a pointer and said selecting means including a dialhaving a scale cooperating with said pointer, and a stop cooperatingwith said poipter for limiting turning movement of th 1a 16. Incombination, a wall having an opening therein, a thermally operateddevice including a thermostatic element capable of passing through saidopening and including a support for disposition on one side of saidopening, a spindle having threaded engagement with said support,selecting means on said spindle for manipulating the spindle to adjustthe thermally operated device from the opposite side of the wall, meanson said support for closing said opening, said means comprising a coverplate, and tang's on said cover plate adapted to be passed through saidopening and turned over at the opposite side of the wall to tie thethermally operated device thereto. 17. In combination, a wall having apair of openings therethrough, a controlling valve body adapted to bepassed through one of said openings, an extension on said valve bodyalso adapted'to be passed through theopening with said valve body, athermally operated device supported upon said extension and capable ofbeing passed through said opening for disposition with said controllingdevice on one side of said wall, a selecting device carried on saidextension with said thermally operated device and having manipulatingmeans therefor,a cover plate on said extension, 'said cover platelimiting the passing of said manipulating meansthrough said opening andclosing saidopening with the manipulating means disposed on the oppositeside of said wall when the device is in installed position, saidcontrolling valve be-' dium supply means, and an oven heat regulatorcomprising a permanently assembled structure adapted for application tothe oven in unitary assembled relation by insertion of one end of theregulator through one of said openings and tilting of the unitaryregu'la'tor assembly with one end so" inserted to bring the inserted endinto position in proximity to one opening and the other e d intoposition in proximity to the other opei ing.

19. The combination with an-oven having a wall of a heat regulator forsaid oven, said 1 regulator conslsting of an extenslon havlng acontrolling device, a thermostatic device and a selecting device allmounted upon said extension in 'pre-correlat-ed relation andconstituting a unitary assembly adapted for application to said oven allin assembled relation and as a unit with the extension and thermostaticdevice in position inside the oven wall and the selecting device inposition outside the oven wall.

20. The combination with an oven having a wall of a heat regulator forsaid oven, said regulator consisting of an extension having acontrolling device, a thermostatic device and a selecting device allmounted upon said extension in pre-correlated relation and constitutinga unitary assembly adapted for application to said oven all in assembledrelation and as a unit withthe extension and thermostatic device inposition inside the oven wall and the selecting device in positionoutside the oven wall, said extension being disposed generallyvertically along the inside of the oven wall when said regulator isapplied to the oven.

21. The combination with an oven having a wall of a heat regulator forsaid oven, said regulator consisting of an extension having acontrolling device, a thermostatic device and a selecting device allmounted upon said extension in pre-correlated relation and con-.stituting a unitary assembly-adapted for application to said oven allin assembled relation and as a unit with the extension and thermostaticdevice in position inside the oven wall and the selecting device inposition outside the oven wall, said extension being disposed generallyvertically along the inside of the oven wall when said regulator isapplied to the oven, the

controlling device being at the lower end of said extension when theregulator is applied to the oven and the thermostatic device being onsaid extension and above said controlling device.

22. The combination with an oven having a wall of a heat regulator forsaid oven, said regulator consisting of an extension having acontrolling device, a thermostatic device and a selecting device allmounted upon said extension in pre-correlated relation and constitutinga unitary assembly adapted for application to the oven all in assembledrelation and as a unit with the extension and thermostatic device inposition inside the oven wall and the selecting device in positionoutside the oven wall, said selecting device having means passingthrough an opening in the oven wall and operatively connected with saidthermostatic device when said regulator is applied to the oven.

23. In combination, an oven having a door opening, a door for saidopening, and an opening other than said door opening in a wall thereof,a controlling device having an extension extending therefrom, athermally sensitive device, a bell crank member transmitting motionbetween said thermally sensitive member and said controlling device, all

capable, while assembled, of being passed through the opening other thanthe door opening in installation.

24. In combination, an oven having a door opening, a door for saidopening, and an opening other than said dooropening in a wall thereof, acontrolling device having an extension extending therefrom, a thermallysensitive member, and a bell crank member for transferring horizontalmovement to vertical movement positioned between said thermallysensitive member and said controlling device, all capable, whileassembled, of being passed through the opening other than the dooropening during installation.

25. In combination, an oven having a door opening, a door for saidopening and an opening other than said door opening in a wall thereof, acontrolling device having an extension extending therefrom, a thermallysensitive device, a selecting device, a bell crank member transmittingmotion between said thermally. sensitive member and said controllingdevice, all capable, while'assembled, of being passed through theopening other than the door opening in installation and. intoposition-with the selecting device extending through the opening otherthan the door opening. i

In witness whereof, we hereunto subscribe our names this 7th day ofAugust, 1929.

OSCAR J. LEINS. HOIVARD C. RAWVLINGS.

